Zhang Youci^{[citation needed]} (Chinese: 張幼慈; pinyin: Zhāng Yòucí), better known as Francisca Yu-Tsz Chang, is a diplomat of the Republic of China, commonly known as Taiwan. She was the first female representative of the Republic of China in Colombia from 2020 to 2021, currently serving as the representative of the Republic of China to Peru.

Zhang graduated from the Spanish Literature Department of Fu Jen Catholic University with a bachelor's degree and the Latin American Institute of Tamkang University with a master's degree.

She served as the second secretary of the embassy in Costa Rica, the head of the training institute for diplomatic and consular personnel of the Ministry of Foreign Affairs, the first-class secretary of the embassy in the Dominican Republic, the Taipei Economic and Cultural Office in Spain, the Ministry of Foreign Affairs' Research and Design Association, Deputy Counselor of the Department of Latin America and the Caribbean of the Ministry of Foreign Affairs, Director of the Central American Economic and Trade Office, and Minister Representative of the Taipei Commercial Office in Colombia. She is currently the Minister Representative of the Taipei Economic and Cultural Office in Peru.^{[1][2][lower-alpha 1][lower-alpha 2]}

In October 2019, on the occasion of the 30th anniversary of the establishment of diplomatic relations between the Republic of China and Belize, the Belizean Embassy and the Central America Trade Office (CATO) jointly held the "Tastes of Belize" Food Festival, as well as a series of celebratory activities such as an art exhibition.^[8][9]

In April 2021, when US Assistant Secretary of State for Western Hemisphere Affairs Julie J. Chung visited Colombia, she had a video meeting with Zhang, with the two discussed cooperation between the United States and Taiwan in Latin America.^[10]

In December 2021, Chairman of the Foreign Affairs and Defense Committee of the Colombian Congress of Colombia, Huo Jing, presented Zhang with the "Colombia Congress Democracy Medal" (Spanish: Condecoración Orden Mérito a la Democracia). Zhang is also the first female envoy of the Republic of China to the country.^[11]